There are two main reasons:
One is because you change your label type or size. In this case, Aobio X4/Q5 does not learn your label, this is the most common reason.
In this case, please run the automatic label identification again.
When the printer is self-studying the label, disconnect the USB cable from your Aobio X4/Q5 printer, avoid sending print commands to the printer.
Another reason is the sensor that detects the paper is affected by dust, if so, please clean the sensor with the alcohol swap.
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